The ASY-EOS experiment at GSI: investigating the symmetry energy at supra-saturation densities

Russotto, P.; Chartier, M.; Filippo, E. De; Févre, A. Le; Gannon, Susanne; Gašparić, I.; Kiš, M.; Kupny, S.; Leifels, Y.; Lemmon, R. C.; Łukasik, J.; Marini, P.; Pagano, A.; Pawłowski, P.; Santoro, S.; Trautmann, W.; Veselský, M.; Acosta, L.; Adamczyk, M.; Alajlan, Abdulrahman; Al-Garawi, M.; Al-Homaidhi, S.; Amorini, F.; Auditore, L.; Aumann, T.; Ayyad, Y.; Baran, V.; Basrak, Z.; Benlliure, J.; Boiano, C.; Boisjoli, M.; Boretzky, K.; Brzychczyk, J.; Budzanowski, A.; Cardella, G.; Cammarata, P.; Chajęcki, Z.; Chbihi, A.; Colonna, M.; Cozma, Dan; Czech, B.; Toro, M. Di; Famiano, M.; Geraci, E.; Greco, V.; Grassi, L.; Guazzoni, C.; Guazzoni, P.; Heil, M.; Heilborn, L.; Introzzi, R.; Isobe, T.; Kezzar, K.; Krasznahorkay, A.; Kurz, N.; Guidara, E. La; Lanzalone, G.; Lasko, P.; Li, Q.; Lombardo, I.; Lynch, W. G.; Matthews, Z. L.; May, L. W.; Minniti, T.; Mostazo, M.; Papa, M.; Pirrone, S.; Politi, G.; Porto, F.; Reifarth, R.; Reisdorf, W.; Riccio, F.; Rizzo, F.; Rosato, E.; Rossi, D.; Simon, H.; Skwirczyńska, I.; Sosin, Z.; Stuhl, L.; Trifiró, A.; Trimarchi, M.; Tsang, M.B.; Verde, G.; Vigilante, M.; Wieloch, A.; Wigg, P.; Wolter, H.H.; Wu, Ping-Hao; Yennello, S. J.; Zambon, P.; Zetta, L.; Zorić, Marko

doi:10.1088/1742-6596/420/1/012092

Cited by 14 publications

(9 citation statements)

References 54 publications

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“…The explicit appearance of meson fields in the Lagrangian density of RMF approaches is suppressed in socalled relativistic point-coupling (PC) models (Nikolaus, Hoch, and Madland, 1992;Rusnak and Furnstahl, 1997;Bürvenich et al, 2002;Zhao et al, 2010). Here fournucleon contact terms, including powers and derivatives thereof, appear with free prefactors that need to be determined.…”

Section: ¼T þV ð14þmentioning

confidence: 99%

“…The density dependence of the symmetry energy at moderate to high densities was studied with the help of n=p ratios and their elliptic flow difference (Cozma, 2011;Russotto et al, 2011Russotto et al, , 2014 as well as π þ =π − ratios (Reisdorf et al, 2007). The analysis of the latter results within transport model simulations suggests a decrease of the symmetry energy at high densities, which is in conflict with most EoS models (Xiao et al, 2009;Xie et al, 2013).…”

Section: Heavy-ion Collisionsmentioning

confidence: 99%

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Equations of state for supernovae and compact stars

et al. 2017

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A review is given of various theoretical approaches for the equation of state (EoS) of dense matter, relevant for the description of core-collapse supernovae, compact stars, and compact star mergers. The emphasis is put on models that are applicable to all of these scenarios. Such EoS models have to cover large ranges in baryon number density, temperature, and isospin asymmetry. The characteristics of matter change dramatically within these ranges, from a mixture of nucleons, nuclei, and electrons to uniform, strongly interacting matter containing nucleons, and possibly other particles such as hyperons or quarks. As the development of an EoS requires joint efforts from many directions, different theoretical approaches are considered and relevant experimental and observational constraints which provide insights for future research are discussed. Finally, results from applications of the discussed EoS models are summarized.

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Section: ¼T þV ð14þmentioning

confidence: 99%

Section: Heavy-ion Collisionsmentioning

confidence: 99%

Equations of state for supernovae and compact stars

et al. 2017

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“…As a result proton elliptic flow values show a non-monotonous dependence on the impact parameter, in contrast to neutrons, making a comparison with predicted values troublesome. The data have been recently reanalyzed [15] in order to determine the optimum conditions for the new ASY-EOS experiment [29] and to extract constraints on the density dependence of the symmetry energy. This effort has also resulted in a smoother impact-parameter dependence of the elliptic flow results for protons.…”

Section: B Experimental Datamentioning

confidence: 99%

Toward a model-independent constraint of the high-density dependence of the symmetry energy

et al. 2013

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Neutron-proton elliptic flow difference and ratio have been shown to be promising observables in the attempt to constrain the density dependence of the symmetry energy above the saturation point from heavy-ion collision data. Their dependence on model parameters like microscopic nucleon-nucleon cross-sections, compressibility of nuclear matter, optical potential, and symmetry energy parametrization is thoroughly studied. By using a parametrization of the symmetry energy derived from the momentum dependent Gogny force in conjunction with the T\'{u}bingen QMD model and comparing with the experimental FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon, a moderately stiff, x=-1.35 +/- 1.25, symmetry energy is extracted, a result that agrees with that of a similar study that employed the UrQMD transport model and a momentum independent power-law parametrization of the symmetry energy. This contrasts with diverging results extracted from the FOPI $\pi^{-}/\pi^{+}$ ratio available in the literature

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“…Such studies have to be further extended by investigations at supra-saturation density in order to obtain non contradicting results when the full parametrization of EOS is applied to describe in a coherent way both astrophysical observations and heavy ion phenomenology [16]. Recently, the CHIMERA detector was involved in a specific experiment at GSI [17] aimed to study elliptic flow observable for neutron and protons taken in coincidence with charged particles [18].…”

Section: Introductionmentioning

confidence: 99%

Experimental effects of dynamics and thermodynamics in nuclear reactions on the symmetry energy as seen by the CHIMERA 4 $ \pi$ detector

Filippo

Pagano

2014

Eur. Phys. J. A

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Abstract. Heavy ion collisions have been widely used in the last decade to constraint the parameterizations of the symmetry energy term of nuclear equation of state (EOS) for asymmetric nuclear matter as a function of baryonic density. In the Fermi energy domain one is faced with variations of the density within a narrow range of values around the saturation density ρ0=0.16 fm −3 down towards sub-saturation densities. The experimental observables which are sensitive to the symmetry energy are constructed starting from the detected light particles, clusters and heavy fragments that, in heavy ion collisions, are generally produced by different emission mechanisms at different stages and time scales of the reaction. In this review the effects of dynamics and thermodynamics on the symmetry energy in nuclear reactions are discussed and characterized using an overview of the data taken so far with the CHIMERA multi-detector array. PACS

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The ASY-EOS experiment at GSI: investigating the symmetry energy at supra-saturation densities

Abstract: This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Cited by 14 publications

References 54 publications

Equations of state for supernovae and compact stars

Equations of state for supernovae and compact stars

Toward a model-independent constraint of the high-density dependence of the symmetry energy

Experimental effects of dynamics and thermodynamics in nuclear reactions on the symmetry energy as seen by the CHIMERA 4 $ \pi$ detector

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